I should probably know this, but....
I have one 4-wire phone line running from the main incoming phone connection
box to a standard phone jack. I want to add a second phone jack next to the
existing one for a second phone line, and I don't want to run a new wire.
So, here's what I am assuming:
1) Inside the existing phone jack, leave the red and green wires from phone
line connected to the red and green connectors inside the phone jack.
2) Then take the black and yellow wires from the phone line and connect them
to the red and green connectors inside the second phone jack for the second
I know what to do with the wires on the other end (at the incoming phone
But, is number 2 above correct?
If so, when matching the yellow and black wires to the red and green
connectors inside the phone jack, is it better or correct to connect the
yellow wire to the red terminal and the black wire to the green terminal?
Or should it be yellow to green and black to red?
The yellow corresponds to the red and the black to the green.
Most modern phones don't care about the polarity of the line but some
old touch tone phones won't dial if they are wired "backwards".
Thanks Jeff. That's exactly what I needed to know. And I guess that's why
I used to hear people talking about making sure the wires aren't backwards
but I don't hear that anymore.
(formerly WN2FPE -- 48 years ago -- built my own Heathkit receiver and
transmitter; put up a long-wire antenna along the roof ridge of my parent's
house; had the receiver working; and never could get the transmitter to work
so I never got to get on the air with anyone.)
You can do what you are suggesting but you should consider this. It
is ok to use both pairs of wires but you have to have special
equipment to use the second line.
A 2 line phone will work but a modem or anything other single line
device will always pick the first line. Also, some phone cords only
come with 2 wires. You have to make sure you get a 4 conductor phone
If you do use both pairs then you should tap off the two line jack and
mount a single jack if you want to use the black/yellow for anything
Or you can buy a jack that has an opening for each line.
Yes. These things plug into a 4-wire jack and provide 3 jacks. 1 is
2-line like the wall jack, 2 is line 1 (red/green) only, 3 is line 2
(yellow/black connected to center 2 contacts) only.
You may find something similar for 3 lines on all 6 wires.
Terry is right. Just buy a splitter. It looks like one of the things
that have a modular plug and two modular jacks, about an inch by an
inch big, for getting two phones out of one jack. But a splitter will
have a "1" on one jack, and a "2" on the other jack. The 1 side willl
have the red and green and the 2 side will have the black and yellow.
(The more common kind, the "2 in 1", won't have any numbers because
both outputs are the same.)
You can also tell by looking into the jacks. The "2 in 1" will have 4
copper springs inside each of the jack holes.
The splitter will only have two spring wires in each, the center two.
The leftmost and right most of the four slots will have no wires.
In the 1980s, I had a two line cordless telephone. Panasonic, I think.
Much as you describe, black and yellow were "line 2". Worked very
Can't remember which colors hooked to which ones. But you have only
two choices of hookup. And many modern phones are not polarity
Christopher A. Young
You can\'t shout down a troll.
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